6444905 has 4 divisors (see below), whose sum is σ = 7733892. Its totient is φ = 5155920.

The previous prime is 6444871. The next prime is 6444937. The reversal of 6444905 is 5094446.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4897369 + 1547536 = 2213^2 + 1244^2 .

It is not a de Polignac number, because 6444905 - 2¹² = 6440809 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 644486 + ... + 644495.

It is an arithmetic number, because the mean of its divisors is an integer number (1933473).

Almost surely, 2^6444905 is an apocalyptic number.

It is an amenable number.

6444905 is a deficient number, since it is larger than the sum of its proper divisors (1288987).

6444905 is a wasteful number, since it uses less digits than its factorization.

6444905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1288986.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 6444905 is about 2538.6817445281. The cubic root of 6444905 is about 186.0967720114.

The spelling of 6444905 in words is "six million, four hundred forty-four thousand, nine hundred five".